A Numerical Analysis of High-Temperature Heat Pipe Startup From the Frozen State

[+] Author and Article Information
Y. Cao, A. Faghri

Department of Mechanical and Materials Engineering, Wright State University, Dayton, OH 45435

J. Heat Transfer 115(1), 247-254 (Feb 01, 1993) (8 pages) doi:10.1115/1.2910657 History: Received January 01, 1992; Revised May 01, 1992; Online May 23, 2008


Continuum and rarefied vapor flows-co-exist along the heat pipe length for most of the startup period. A two-region model is proposed in which the vapor flow in the continuum region is modeled by the compressible Navier-Stokes equations, and the vapor flow in the rarefied region is simulated by a self-diffusion model. The two vapor regions are linked with appropriate boundary conditions, and heat pipe wall, wick, and vapor flow are solved as a conjugate problem. The numerical solutions for the entire heat pipe startup process from the frozen state are compared with the corresponding experimental data with good agreement.

Copyright © 1993 by The American Society of Mechanical Engineers
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